By light 7%, only about 50,000 hours. By light 3%, use up to 80,000 hours.

2. the LED will not heat it?

Will need cooling.

3. the LED could replace incandescent bulbs do?

Luminous flux, light effects and color can be, but it's too expensive and not declined in recent years. But you can increase the flux of products so as to reduce the cost of replacing incandescent light bulbs.